Messages in this thread | | | Subject | Re: [PATCH] MIPS: Introduce cmdline argument writecombine= | From | Jiaxun Yang <> | Date | Fri, 7 Aug 2020 02:26:03 +0800 |
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在 2020/8/7 上午12:52, Thomas Bogendoerfer 写道: > On Thu, Aug 06, 2020 at 07:56:20PM +0800, Jiaxun Yang wrote: >> Our current problem is Loongson's writecombine implementation seems buggy. >> This is our platform issue rather than target hardware issue. > ok, so simply clear cpu_data[0].writecombine for the fauly parts @Tiezhu,
I don't know the exact faulty parts, could you please investigate it in Loongson?
I can remember a Loongson stuff told me the issue was solved in GS464E but there are still users complaining about that.
In fact I can't reproduce it in all of my test systems: 3B1500 + RS780E + R5 230 3A3000 + RS780E Laptop 3A4000 + LS7A + RX550 >> And we don't even know which hardware is known to be good. The same graphic >> card became a different story on different user's hand. > find out what is broken and add the needed workarounds then.
Well, let's leave this task for Loongson company. User's community don't have the ability to trace hardware behavior precisely.
>> I understood what Teizhu thought. For entry-level users, we don't want to >> trouble >> them, so we have writecombine disabled by default. However, for advanced >> user >> trying to tweak their system, we should leave a switch for them to get it >> back. > IMHO if we do it that way, we end up with millions of knobs for tweaking > broken hardware, and nobody knows what's exactly broken. Sorry I won't go > that way.
Haha, that was my first impression to Linux as a primary school student. It just looks like an aircraft cockpit with thousands of knobs & switches, but to airborne you just need to control yoke and throttle.
- Jiaxun
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